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Frequency component analyzer

A technology of frequency components and analysis devices, which is applied in measuring devices, spectrum analysis/Fourier analysis, testing of machines/structural components, etc., can solve problems such as difficulty in accurate judgment and shortening of time for knock discrimination and processing

Active Publication Date: 2013-05-29
HONDA MOTOR CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, since this is not taken into account in the device disclosed in Patent Document 1, the time for knock discrimination processing using the frequency component intensity obtained by frequency component analysis can be ensured to be shortened, and accurate judgment is likely to become difficult

Method used

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Embodiment Construction

[0037] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0038] figure 1 It is an overall configuration diagram of an internal combustion engine (hereinafter referred to as "engine") and its control device according to an embodiment of the present invention. For example, a throttle valve 3 is disposed in the middle of an intake pipe 2 of a four-cylinder engine 1 . The throttle valve 3 is connected to a throttle opening sensor 4 that detects a throttle opening TH, and a detection signal from the sensor 4 is supplied to an electronic control unit (hereinafter referred to as “ECU”) 5 .

[0039]For each cylinder, a fuel injection valve 6 is provided slightly upstream of an unillustrated intake valve located between the engine 1 and the throttle valve 3 and in the intake pipe 2, and each injection valve is connected to an unillustrated intake valve. The fuel pump is connected and electrically connected to the ECU 5 , and the open...

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Abstract

A frequency spectrum analyzing apparatus for performing a frequency spectrum analysis with respect to a detected value of an operating parameter of an internal combustion engine in synchronism with rotation of the engine, is provided. The operating parameter is sampled at predetermined time intervals, and a sampled value is converted to a digital value. Intensities of first and second elements are calculated with respect to a predetermined number of the sampled values. The first elements and second elements respectively correspond to a plurality of frequency components contained in the detected value, and a phase of the second element differs from a phase of the first element by 90 degrees. Frequency component intensities corresponding to the plurality of frequency components are calculated in synchronism with rotation of the engine, using the first element intensities and the second element intensities. The frequency component intensities are calculated by replacing a part of an integrated value of the first element intensities, and a part of an integrated value of the second element intensities respectively with corresponding preceding calculated values, when an rotational speed of the engine is higher than or equal to a set threshold value.

Description

technical field [0001] The present invention relates to a frequency component analysis device that performs frequency component analysis of detected values ​​of operating parameters of an internal combustion engine in synchronization with the rotation of the internal combustion engine. Background technique [0002] Patent Document 1 discloses a signal processing device using a discrete Fourier transform (Discrete Fourier Transform) algorithm (hereinafter referred to as "DFT algorithm") and a fast Fourier transform (hereinafter referred to as "FFT algorithm") ), the frequency component analysis of the output signal of the knock sensor mounted on the internal combustion engine is performed. The FFT algorithm employs a special algorithm in order to increase the calculation speed, so there are cases where the intensity of the required frequency component (specifically, the center frequency component of the knock sensor output signal) cannot be obtained. Therefore, in the signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D45/00F02P5/152F02P5/153G01M15/00G16Z99/00
CPCG01M15/12G01L23/225G16Z99/00G01L23/221G01R23/16G05B15/00G06F17/00
Inventor 北村夏子明本禧洙高木治郎仓内淳史义煎将之小松弘崇广田和彦村上真
Owner HONDA MOTOR CO LTD